In greenhouse vegetable cultivation and management, the humidity in the greenhouse is high, which is not conducive to the normal growth and development of vegetable crops. The high humidity and high temperature make it easy for the plants to grow long, and high humidity and low temperature can easily induce the roots of the roots and cause the death of the plants. The high humidity in the shed has also created conditions for the occurrence and spread of various diseases in vegetables. Therefore, it is very important to scientifically control the air humidity in the shed. Here are 10 effective measures to reduce the air humidity in the shed:
One, covered with no drip film
The drip-free membrane can overcome the disadvantages of a large number of water droplets attached to the inside of the membrane, significantly reducing the humidity, and the light transmission performance is good. The light transmittance is 10%~15% higher than that of the general agricultural film, which is favorable for increasing temperature and decreasing humidity.
Second, ventilation and dehumidification
Exhalation is the main measure of dehumidification. Generally, it should be carried out before and after noon, with the main wind and waistline being the main wind. The footwell wind must not be placed in order to prevent the temperature of the greenhouse from being too low and “sweeping the wind†to hurt the seedlings. In the winter and early spring, it is not advisable to let the morning winds drain moisture. Ventilate early in high temperature seasons, pass strong winds, close winds in the evening, and use short-term ventilation when the outdoor temperature is high at noon even on cloudy days. If the humidity in the shed is high and the temperature is above the minimum temperature limit for crop growth, the amount of ventilation should be gradually increased, and the air humidity should be reduced as soon as possible. However, the cooling caused by ventilation should be based on the premise that the crop does not suffer from cold damage.
Third, plastic film coverage
The use of mulching can reduce the evaporation of soil moisture, and can reduce the number of irrigation, which is an important measure to reduce the indoor air humidity. For example, in the shed, large and small ridges and ridges are used to cover the ridges. When water is poured, the water flows into the small ridges below the mulch. The mulch prevents the evaporation of moisture, which also prevents the air humidity of the watering shed from increasing significantly.
Fourth, reasonable watering
Watering is the main factor that causes the humidity in the shed to increase. The number of waterings and the amount of watering each time depends on the weather, soil conditions, types of vegetables, growth period and growth potential. Generally, small water or gutters should be poured, and flooding or flooding should be avoided. If vegetable vegetables, planting water and seedling water are to be thoroughly saturated, the water supply will be sufficient during the result period, and watering will not be required in other periods. When the temperature in the shed is low, especially if ventilation is not allowed, watering should be controlled as much as possible, and irrigation can not be performed by using a broom irrigation method. Watering should be sunny from 10 to 12 o'clock in the morning, and cooperate with ventilation to remove moisture. Do not water in the afternoon, cloudy and rainy days. Avoid watery days after watering. When conditions permit, furrow irrigation or drip irrigation can be used to reduce the amount of irrigation and evaporation.
Fifth, the use of good thermal insulation curtain material
A moisture-permeable and moisture-absorbing insulation curtain material, such as a non-woven fabric, can prevent condensation on the inner surface and prevent dew from falling onto the plants, thereby reducing air humidity and crop wetting.
Six, warming and humidity
The relative humidity in the air drops by 3% to 5% for every 1°C increase in temperature inside the shed. Using warming and dehumidification can not only meet the temperature requirement of vegetables, but also reduce the relative humidity of air. When the plant grows to have strong resistance, the watering canopy can be heated up to about 30°C for 1 hour, and then ventilated and vented. After 3~4 hours, the temperature of the shed can be less than 25°C.
VII. Dust and smog drugs
The air humidity in the shed is inherently large, and the use of conventional spraying methods increases the humidity, which is detrimental to disease prevention and control. The use of dust and smog method can avoid increasing the air humidity due to spraying and improve the control effect.
Eight, wet cultivation
When the temperature of the greenhouse is high, the surface of the greenhouse is shallow, which accelerates the evaporation of the topsoil, and at the same time cuts off the pores of the soil and prevents the deep water from moving upwards.
Nine, hanging light curtain
Hanging light curtains can not only increase the light intensity, but also increase the ground temperature and temperature around 2°C. Because the relative humidity decreases as the temperature rises, the hanging light curtain also has a certain degree of dehumidification.
Ten, natural hygroscopic
In the shed, rice straw, wheat straw, and quicklime can be used to spread water vapor or fog between the rows to achieve the purpose of dehumidification.
Head Immobilizer,Universal Head Immobilizer,First Aid Head Immobilizer,Spine Board With Head Immobilizer
jiangyin chenyi medical technology co.,ltd , https://www.chenyimed.com